Respiratory mask



FIG. 1 is a perspective view of a respiratory mask showing the newdesign;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a back elevation view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a second perspective view thereof.

CLAIM The ornamental design for a respiratory mask, as shown anddescribed.